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EVA laminated glass film is the main raw material for producing safety laminated glass. However, whether qualified safety laminated glass can be produced smoothly is closely related to many factors, such as equipment (laminating furnace), production process, glass and auxiliary materials, environmental and climatic conditions, employees' operational skills and work responsibility, and the quality of the film
Just one of the constraining factors. Therefore, when making reinforced and safety laminated glass, operators should learn to analyze comprehensive factors and master comprehensive production skills.
Regarding the use of film
1. Before normal production, in order to ensure product quality, it is necessary to carefully and meticulously inspect the clamping equipment (vacuum system, heating system, control system) to eliminate any interference caused by equipment failure on product quality.
2. Due to the inherent variability and force majeure of film production, it is recommended that users make a small glass sample (with a glass area of not less than 0.5m2) before using each batch of film to identify and determine its quality and color. After confirming its accuracy, it can be put into mass production to prevent batch scrap caused by discrepancies between the bulk film and the sample. For color children's films, we do not recommend using the same film from two different batches (with longer intervals) in the same order, as this can easily cause color errors.
3. In rainy weather or when the humidity in the workshop environment is greater than 65%, film, silk, photographic materials, and glass can all be affected by moisture and seriously affect the bonding strength of the cells. When producing laminated glass, it is necessary to inspect the original glass that has been cleaned or wiped in advance. Water stains or trace amounts of water vapor on the glass beads must be wiped clean (if conditions permit, it is best to use a dryer), and the intermediate materials should also be dried. Otherwise, the laminated (reinforced) glass produced is prone to bubbles and delamination within a certain period of time. Therefore, it is recommended that customers avoid rainy days with high humidity as much as possible during production.
4. During the process of film discontinuation, it is inevitable that there will be slight contamination, such as trace impurities on the film surface. It is recommended that customers install a set of fluorescent tubes under the film laminating table to more clearly inspect the film surface for impurities, stains, and other imprints.
5. When using intermediate materials such as non-woven cotton, paper or plastic printed products, natural fiber fabrics, etc. in the process of making laminated glass or reinforced glass, the surface characteristics of these intermediate materials should be carefully understood in advance, because some intermediate materials have undergone coating treatment or printing (printing and dyeing) treatment on the surface, which may cause adverse chemical reactions with EA film and affect the bonding strength of the film. Therefore, it is necessary to conduct experimental testing and aging treatment on these materials during use, and not blindly produce them. Not all forest materials are suitable for laminating. At the same time, it is recommended to perform an appropriate drying treatment on these materials to eliminate trace amounts of moisture contained in them. Practice has proven that laminated glass made with damp intermediate materials is prone to localized small amounts of foaming and delamination after being left for a period of time.
6. The laminated glass is produced and processed using the principle of "simultaneous action of high temperature and pressure", therefore. At a certain temperature, solid film will become a flowable liquid, which is easily discharged from the outer edge of the glass under pressure. However, the film around the edges of the glass is subjected to high pressure, making it easier to clear and reduce its thickness. When the film cools and shrinks, it is very easy to form local bubbles (delamination) around the glass. Therefore, it is recommended that customers adopt the "surrounding enclosure technology" for production and processing, and the material of the enclosure should be slightly higher than the thickness of the glass. This method can reduce the excessive pressure caused by vacuum negative pressure on the periphery of the glass during molding, and reduce the amount of film outflow.
7.Different varieties of glass or film should not be produced using the same process in the same furnace, otherwise it is difficult to ensure product quality. Normally, the processing temperature of colored film is slightly higher than that of transparent film; The processing temperature for processing thick film or thick glass products should be slightly higher than that for processing thin film or thin glass products; The processing temperature of embroidery and silk products should be slightly higher than that of single-layer film products; When the temperature should not be too high, the method of "extending the insulation time" can be used to achieve the effect of increasing the temperature.
8. The cooling time after glass forming is also important. In theory, the faster the cooling speed when processing transparent film, the better its transparency. However, if the temperature difference between the hot and cold temperatures encountered after the glass is taken out of the furnace is too large, it is highly likely to cause cracking of the laminated glass or trace bubbles around it. Therefore, during summer production, when the ambient temperature is high, high-power electric fans can be used to assist in cooling; During winter production, the ambient temperature is low and there is a large temperature difference between the inside and outside of the furnace. Therefore, it is necessary to appropriately extend the natural cooling time while maintaining a vacuum state inside and outside the furnace, so that the glass can be removed only when the temperature drops to around 60 degrees at a constant speed
9. The laminated glass after molding should not be immediately edged, otherwise it will affect the adhesive strength of the film (the surrounding area is prone to delamination). It is recommended that customers store the glass for 24 hours after it has been formed before grinding. Before grinding, try to remove excess adhesive material with a knife; For safety reasons, the method of first grinding the edges of the glass and then forming it can effectively prevent water ingress and foaming around it. It is recommended to use a fine-grained grinding wheel to repeatedly grind the edges. Coarse grinding wheels or large "cutting amounts" can easily cause glass expansion microcracks and lead to damage around the glass. For some intermediate materials with coarse fibers that are prone to water absorption, it is recommended to grind the edges first and then apply glue, as the exposed fiber materials are prone to absorbing moisture during edge grinding, which can lead to film delamination in the later stage.
